Three-phase equilibrium single-double pole electric slag furnace

Abstract

The invention discloses a three-phase equilibrium single-double pole electric slag furnace. The three-phase equilibrium single-double pole electric slag furnace is characterized in that a rectification device 1 is connected with a power grid three-phase power source 6 through a three-phase inlet wire, and a two-phase passing transformer 7 in the power grid three-phase power source 6 is connected with an ordinary electric slag furnace 2. An output end of an insulated gate bipolar translator (IGBT) flow variable module 9 in the rectification device 1 is connected with the three-phase inlet wire through a lower control limit (LCL) filter circuit 8, and an a end in a secondary coil of the transformer 7 is connected with the upper end of an electrode 4 inside a boiler 5 through an A short net impedance 3. The bottom of the boiler 5 is connected with a b end in the secondary coil of the transformer 7 through a B short net impedance 10. The three-phase equilibrium single-double pole electric slag furnace has the advantages that compared with the prior art, the problem that a single-phase electric slag furnace causes three-phase imbalance to a power grid is solved, the laden power factor is improved, a series of impacts brought by the problem of the unbalanced power grid are reduced, the investment cost of a steel making enterprise is saved, simultaneously the purposes of energy conservation and emission reduction are achieved, the utilization rate of electric energy is improved, and the pollution to the power grid is reduced.

Description

Technical field [0001] The invention relates to a three-phase balanced single-bipolar electroslag furnace used for smelting metals and alloys in steel-making enterprises. Background technique [0002] At present, the electroslag furnaces used by steelmaking enterprises are basically single-phase electroslag furnaces, which mainly include two types: unipolar and bipolar. In the process of electroslag furnace remelting, as the melting progresses, the electrodes continue to shorten and the steel ingot gradually rises, resulting in the electrode resistance and the resistance of the steel ingot being in a state of change, resulting in voltage and current fluctuations. [0003] At the same time, when companies use single-phase electroslag furnaces to make steel, they basically select two of the three phases of the power grid A, B, and C to connect to the electroslag furnace through a transformer, which causes the current flowing into the power grid to have zero phase. It may cause th...

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Problems solved by technology

[0004] The present invention provides a three-phase balanced single-bipolar electroslag furnace. Its purpose is to integrate the ordinary electroslag furnace and the correction device to solve the problem of three-phase imbalance, improve the power factor of the load, and reduce the cost of the enterprise. Production costs, to achieve the purpose of energy saving and emission reduction

[0006] Beneficial effects of the present invention: compared with the prior art, it solves the three-phase imbalance problem caused by the single-phase electroslag furnace to the power grid, improves the power factor of the load, and reduces a series of influences caused by the power grid imbalance problem , which saves the investment cost of steelmaking enterprises, and at the same time achieves the purpose of energy saving and emission reduction, improves the utilization rate of electric energy, and reduces the pollution to the power grid

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